Forging or casting with gripping and driving lugs



c. G. HEIBY, J. BURKAM, D. E. LINDQUIST, F. L. meem, E. w. ALLEN AND R. LAU.

FORGING 0R CASTING WITH'GRIPFING AND DRIVING LUGS.

APPLICATION FILED JAN. 17, I918.

Patented Apr. 5, 1921..

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CARL G. HEIBY, JOHN BURKAM, DAVID E. LINDQUIST, FRED L. RIGGIN, EBENEZER w. ALLEN, AND RICHARD LAN, or S RNIA, ONTARIO, c N DA, ASSIGNORS, BY MESNE ASSIGNMENTS, To MUELLER METALS COMPANY, or PORT HURON, MICH- IGAN, A CORPORATION OF MICHIGAN.

FORGING OR CASTING WITH GRIPPING AND DRIVING LUGS.

To all whom it may concern;

Be it known that we, CARL G. HEIBY, JOHN BURKAM, DAVID E. LIND UIST, FRED L. RIG- GIN, EBENEZER W. ALLEN, and RICHARD LAU, all citizens of the United States except ALLEN, a subject of Great Britain, residing at Sarnia, in the county of Lambton and Dominion of -Canada, have invented new and useful Improvements in Forging or Casting with Gripping and Driving Lugs, of which the following is a specification.

The present invention relates to articles, either forged or cast, and which may be of various shapes, which are subjected to machining or finishing operations, and has for its object to provide convenient gripping and driving means for these articles, in order that the machining and finishing .of such articles may be readily accomplished, and, furthermore, that the loss of metal, and the work incident to completing the articles may be very much reduced.

r n the present invention the article selected to illustrate the invention is a fuse cap, but it will be understood that the invention is not confined to the specific illustration here Shown, as obviously it may be adapted to a variety of articles other than the particularone here shown.

In-the making of articles of the character herein disclosed, it is customary to machine them from the original Stock, and in some instances they arcinitially formed to approximately their final form by forging or casting. The machining of articles from stock, such, for example, as the fuse cap herein shown is, of course, a slow and expensive process, and much metal is lost where the machining methodis adopted, and obviously the time Spent to machine a blank orslug to its finished form is so great as to render the cost of producing articles practically prohibitive, particularly where they must be produced in large quantities wlthin a Short space of time.

The method of reforming or roughing out articles by forging orv casting, as heretofore practised, has been unsatisfactory, in that means have been lacking by whichthe arti- Specification of Letters Patent.-

Patented Apr. 5, 1921.

Application filed January 17, 1918. Serial No. 212,229.

cles could be prop erly chucked and held in the lathe or other finishing machine for the provide means for gripping the blank in' a finishing machine and driving it or holding it stationary for the action of a tool, such grlpplng and .driving means being so disposed as that they will not interfere with the proper finishing of the article, and which gripplng and driving means moreover may be readily removed by machining them off as the final step in the finishing of the article, and with a minimum loss of metal, because of the removal of the gripping and driving parts.

In order-that the invention may be understood by those skilled in the art, we have illustrated in the accompanying drawings a fuse cap made in accordance with the inven tion, and .in said drawings:

Figure 1 is a slug or blank from which the-cap is forged, and this slug or blank may.

Fig. 1 to the action of a die press.

Fig. 3 1s a view showing the fuse cap after the flash has been trimmed.

Fig. 4 is a view in cross section of the finished fuse cap. Fig. 5 is a view of a blank having grip-- ping surfaces but with the driving lug omitted.

Fig. 6 is a view in side elevation of a slightly different form of fuse cap blank.-

Fig. 7 is a view in cross section of the finished fuse cap formed from the blank shown in Fig. 6.

Fig. 8 is a view in side elevation of a fuse cap blank having a Slightly different arrangement of driving lugs,

produced by subjecting the slug shown in Referring to the drawings by numerals, like numbers indicating like parts in the several views, 10 indicates the slug from which the blank is forged, this slug being formed in any suitable manner, either by individual casting or by cutting from suitable stock, as the particular manner in which the slug is produced is not essential so far as the present invention is concerned.

The said slug 10 is s'ubjectedto the action of a forging press and brought to the form shown in Fig. 2, in which it will be observed that the blank 11 is of substantially the finished form of the fuse cap, having its exterior of substantially the final shape shown in Fig. 4, and the cavities 12 and 13 formed in the opposite ends thereof, the slight excessof metal being projected in the form of a flash 14, which is afterward trimmed off and may be remelted, after such trimming the blank taking the form shown in Fig. 3.

In the forging operation there is formed at the top of the blank a cylindrical projection 15 which forms a gripping surface,

so that the blank may be readily clamped in a chuck for the machining and finishing operations, and in order that there may be a proper driving means there is forged on the blank, preferably, although not necessarily, adjacent and outstanding from the cylindrical projection 15 a driving lug. or projection 16, which will afford a po itive driving element to be engaged by the cl iucking head of the lathe, or, if the article is to be held stationary and acted on by a rotating tool, will engage the jaws of the vise or chuck in which the article is held, and

prevent its rotation while being machined or finished by the rotating tool. This projection 16 may take various forms, but in the present instance is shown as a thin vertically disposed rib, and is preferably placed, as shown, on the vertical wall of the projection15. j

After the fuse cap. blank has been subjected to the finishing operations, which include threading of the cavity 13 and boring the necessary passages therein, the projection 15 with the outstanding driving lug 16 will be machined off so as to give the finished cap, shown in Fig. 4.

By forging the blank as shown with the cavity 12 in the projection 15, which forms the gripping surface, there. is comparatively little metal to be machined away in the final finishing operation, this machining (see Fig. 3) extending substantially to the top line shown in Fig. 3, and necessitating "the removal of the annular rib surrounding the cavity 12 and the outstanding lug 16, the rest of the metal, by reason of the depression or cavity 12, being utilized in the formation of the blank. This results not only .in a saving of metal, but in a saving of maybe readily chucked and handled in machinlng is provided.

In some instances the driving lug may be omitted, as shown in Fig. 5, and the plain gripping surface 17 utilized for chucking purposes. 1

In the form of the invention shown in Fig. 6, which is a slightly different form of fuse. cap, the cylindrical gripping surface 18 is provided, together with thedriving lug 19 projecting from the wall thereof, and this gripping surface, together with the lug, has the internal depression indicated in dotted lines in Fig. 6, similar to that cavity or depression described in connection with the other form of fuse cap. Tn finishing the fuse cap and bringing it to the final form shown in Fig. 7, the cylindrical projection 16 and the lug 19 will be trimmed ofi substantially on the dotted lines shown in Fig. 6, so that but very little metal will be lost, and the labor of machining will be comparatively slight.

In Fig. 8 there is shown a slightly difierent arrangement of lugs, for in that figure are provided lugs 20 and 21 on the cylindrical projection at the top of the fuse cap, and, furthermore, the shankor lower portion 22 of the fuse cap has a driving lug 23 thereon, so that the blank may be readily chucked at either end for finishing-operations upon the opposite end.

This construction gives a cap which may be very conveniently manipulated in a lathe or other finishing machine, and it is obvious and driving means, it is secured at very slight expense so far as loss of metal and machine work is concerned, and, furthermore, is produced simultaneously with the forging of the blank.

We claim:

1. As a new article of manufacture, a blank-for fuse caps and like articles, having a body portion of substantially cone-like formation, with a gripping surface of ringlike form extending from the small end of said body portion, said gripping surface having a centrally disposed depression or cavity, and a driving lug projecting laterally from the outer wall of said gripping surface.

2. The method of forming fuse caps and.

like articles, which consists in shaping a blank to a substantially cone-like form with a cavity in-the base thereof, a hollow gripping surface of substantially ring-like or annular form extending from the small enol of the cone-like bodyportion, and a driving lug extending laterally from the outer Wall of said hollow gripping surface, machining and finishing the blank, and finally removing so much of the hollow gripping ring or annulus as is necessary to bring the body portion to finisheol form.

set our hands.

CARL G. HEIBY. Jenn BURKAM. DAVID E. mnnonis'ir. FRED L. RIGGlNu EBENEZER W; ALLEN. RICHARD LAU. 

